KAMOME REACTION AND BULB RUDDER
Concept
KAMOME REACTION AND BULB RUDDER is an energy-saving rudder that improves propulsion efficiency by combining a reaction rudder with bent upper and lower leading edges of the rudder blade to generate rudder thrust from the propeller slip stream, and a spindle-shaped rudder bulb fitted close to the propeller hub.
The rudder resistance is reduced by appropriately bented upper and lower leading edges of the rudder blade, and the spindle-shaped rudder bulb reduces the hub vortex generated by the propeller to the utmost.
The design concept of KAMOME REACTION AND BULB RUDDER is to combine these optimally.
Principle of reaction valve rudder
Recovery of swirling flow loss due to reaction rudder (leading edge) shape to match the propeller swirling flow.
Increased wake gain by the displacement effect of bulb.
Reducing hub vortex.
Using both CFD calculations and towing tank tests, the optimum shape to achieve the highest energy savings is designed.
Tank test
Principle of reaction valve rudder
30% reduction of rudder resistance
(compared to our conventional K-7 rudder)
Due to bending the upper and lower leading edges of the rudder blade reduces rudder resistance, and the bulb reduces hub vortexes, a 30% reduction in rudder resistance is achieved.
Propulsion efficiency improved by 4%
(compared to our conventional K-7 rudder)
The reduction in rudder resistance due to the reaction rudder and the recovery of hub vortex energy due to the rudder bulb improve the ship’s propulsion efficiency by approximately 4%.
Propulsion efficiency improved by 4%
(compared to our conventional K-7 rudder)
The reduction in rudder resistance due to the reaction rudder and the recovery of hub vortex energy due to the rudder bulb improve the ship’s propulsion efficiency by approximately 4%.
※Can also be combined with our energy-saving SG propeller.
※Compatible with our K-7 H type (Hanging type), M type (Mariner type), and S type (with Shoe-piece).